Home Postcodes by state ACT 2912 Postcode 2912 2912 is the postcode for Gungahlin, ACT. Localities with postcode 2912GungahlinACT Postcode 2912 State or territory Australian Capital Territory (ACT) Localities 1 Council area None: the ACT Government provides local services Council area based on Australian Bureau of Statistics data (ASGS Edition 3), CC BY 4.0. Postcode 2911 · Postcode 2913